Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

NPA: 435 [Rate centres in NPA 435] [Dial plan for NPA 435]

NXX: 666

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
435-666 A Park City UT SLKCUT26BMD  965H FRACTEL, LLC 660      
435-666 0 Park City UT   6571 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 660   2020-06-18   
435-666 1 Park City UT   318J COMCAST IP PHONE, LLC 660   2019-11-02   
435-666 2 Park City UT   073H TELNYX LLC 660   2020-10-03   
435-666 3 Park City UT   624H ONVOY SPECTRUM, LLC 660   2020-07-06   
435-666 4 Park City UT   624H ONVOY SPECTRUM, LLC 660   2020-07-06   
435-666 5 Park City UT   624H ONVOY SPECTRUM, LLC 660   2020-07-06   
435-666 6 Park City UT   965H FRACTEL, LLC 660   2019-03-26   
435-666 7 Park City UT   871E ONVOY, LLC - UT 660   2020-11-23   
435-666 8 Park City UT   871E ONVOY, LLC - UT 660   2021-03-17   
435-666 9 Park City UT   526H PEERLESS NETWORK OF UTAH, LLC - UT 660   2020-06-30   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.